Increasing accessibility and reactivity of paper grade pulp by enzymatic treatment for use as dissolving pulp
2008 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 23, no 4, 363-368 p.Article in journal (Refereed) Published
In this study, the feasibility of using different kraft pulps as dissolving pulps for the viscose process was investigated. Two different bleached hardwood kraft pulps from eucalypt (Eucalyptus globulus) and birch (Betula pendula) were subjected to several enzymatic and chemical pretreatments in order to improve the accessibility and reactivity of the pulps and to reduce the hemicellulose content. Enzymatic treatments were carried out using a commercial monocomponent endoglucanase and a commercial xylanase. Chemical treatment consisted of an alkali extraction. The effects of these pretreatments on reactivity and viscosity were assayed. In both pulps, the endoglucanase enhanced the cellulose reactivity and reduced the viscosity. The sequential combination of xylanase and endoglucanase enhanced the positive effect of endoglucanase treatment alone for eucalypt but showed no major effect for birch. The addition of an alkali extraction step after the xylanase followed by endoglucanase treatment as a final step significantly reduced the hemicellulose content to 24% while the reactivity reached the value of a commercial dissolving pulp (65-70%). The viscosity, on the other hand, showed a considerably decrease.
Place, publisher, year, edition, pages
2008. Vol. 23, no 4, 363-368 p.
Hardwood, Kraft pulp, Dissolving pulp, Reactivity, Xylanase, Monocomponent endoglucanase, Alkali extraction
IdentifiersURN: urn:nbn:se:kth:diva-8614DOI: 10.3183/NPPRJ-2008-23-04-p363-368ISI: 000262102700002ScopusID: 2-s2.0-58149242427OAI: oai:DiVA.org:kth-8614DiVA: diva2:13983
QC 20100917. Uppdaterad från Manuskript till Artikel (20100917).2008-06-032008-06-032012-03-20Bibliographically approved